Sea Lion Diego
Utah’s Hogle Zoo mourns the passing of California sea lion Diego
Utah’s Hogle Zoo is deeply saddened to share the loss of male California sea lion, Diego, who passed away on October 22, 2025.
In 2024, Diego was diagnosed with degenerative disc disease, a spinal condition that affected his mobility and caused limited movement in his rear flippers. Over the past year, Diego’s animal care and veterinary teams worked closely to provide ongoing treatments for his degenerative disc disease, including laser therapy, medications, training adjustments, and habitat evaluations to ensure mobility and comfort.
On October 20, 2025, his team observed a sudden decrease in his appetite and behavior, indicating significant discomfort. Despite focused care and treatment in the days that followed, his condition did not improve. While medications helped keep Diego comfortable, his mobility was severely limited, and it became clear that his quality of life had declined.
After careful consideration, the animal care and veterinary teams made the difficult decision to say goodbye to Diego through humane euthanasia. He was surrounded by his keepers and hospital staff who cared for him deeply and worked tirelessly to ensure he received the best possible care throughout his life.
Diego arrived at Hogle Zoo in 2017 and quickly became a favorite among guests and staff alike. Known for his loud vocalizations, curious personality, and strong bonds with his care team, Diego brought energy and joy to the Rocky Shores habitat.
Diego’s care team described him as an incredibly special sea lion full of personality. He loved sardines and playing in the water. He was eager to learn new things and participate in fun, challenging games during training sessions, creating unique bonds with his trusted care team.
Diego has been a part of many zoo visits and memories. Thank you for your kind words, compassion, and support as our teams grieve the passing of this beloved member of Rocky Shores.
About California sea lions
California sea lions are found along the west coast of North America. With streamlined bodies, large front flippers to propel their bodies forward, and rotatable rear flippers that function like a rudder, sea lions have unique adaptations to help them move on land and in the water. When diving, California sea lions slow their heart rates, which allows them to remain underwater for nearly 10 minutes before surfacing for air. Their long whiskers act like antennae, helping them sense the movements of fish and predators underwater.
Animal Wellbeing
Hogle Zoo is committed to providing excellent animal wellbeing through individualized health care plans, including advanced care if resident animals develop degenerative diseases or experience rapidly declining health. Regular consultation with community health partners is pivotal to achieving that commitment.
Follow us @HogleZoo for more Zoo Stories
Utah's Hogle Zoo
